pthread_spin_lock(3) - Linux manual page (original) (raw)

pthreadspinlock(3) Library Functions Manual pthreadspinlock(3)

NAME top

   pthread_spin_lock, pthread_spin_trylock, pthread_spin_unlock -
   lock and unlock a spin lock

LIBRARY top

   POSIX threads library (_libpthread_, _-lpthread_)

SYNOPSIS top

   **#include <pthread.h>**

   **int pthread_spin_lock(pthread_spinlock_t ***_lock_**);**
   **int pthread_spin_trylock(pthread_spinlock_t ***_lock_**);**
   **int pthread_spin_unlock(pthread_spinlock_t ***_lock_**);**

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

   **pthread_spin_lock**(), **pthread_spin_trylock**():
       _POSIX_C_SOURCE >= 200112L

DESCRIPTION top

   The **pthread_spin_lock**() function locks the spin lock referred to
   by _lock_.  If the spin lock is currently unlocked, the calling
   thread acquires the lock immediately.  If the spin lock is
   currently locked by another thread, the calling thread spins,
   testing the lock until it becomes available, at which point the
   calling thread acquires the lock.

   Calling **pthread_spin_lock**() on a lock that is already held by the
   caller or a lock that has not been initialized with
   [pthread_spin_init(3)](../man3/pthread%5Fspin%5Finit.3.html) results in undefined behavior.

   The **pthread_spin_trylock**() function is like **pthread_spin_lock**(),
   except that if the spin lock referred to by _lock_ is currently
   locked, then, instead of spinning, the call returns immediately
   with the error **EBUSY**.

   The **pthread_spin_unlock**() function unlocks the spin lock referred
   to _lock_.  If any threads are spinning on the lock, one of those
   threads will then acquire the lock.

   Calling **pthread_spin_unlock**() on a lock that is not held by the
   caller results in undefined behavior.

RETURN VALUE top

   On success, these functions return zero.  On failure, they return
   an error number.

ERRORS top

   **pthread_spin_lock**() may fail with the following errors:

   **EDEADLOCK**
          The system detected a deadlock condition.

   **pthread_spin_trylock**() fails with the following errors:

   **EBUSY** The spin lock is currently locked by another thread.

STANDARDS top

   POSIX.1-2008.

HISTORY top

   glibc 2.2.  POSIX.1-2001.

CAVEATS top

   Applying any of the functions described on this page to an
   uninitialized spin lock results in undefined behavior.

   Carefully read NOTES in [pthread_spin_init(3)](../man3/pthread%5Fspin%5Finit.3.html).

COLOPHON top

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Linux man-pages 6.10 2024-07-23 pthreadspinlock(3)

Pages that refer to this page:pthread_spin_init(3), pthreads(7)